Copper speciation in variably toxic sediments at the Ely Copper Mine, Vermont, United States
Bryn E. Kimball, Andrea L. Foster, Robert R. Seal II, Nadine M. Piatak, Samuel M. Webb, Jane M. Hammarstrom
2016, Environmental Science & Technology (50) 1136
At the Ely Copper Mine Superfund site, Cu concentrations exceed background values in both streamwater (160–1200 times) and sediments (15–79 times). Previously, these sediment samples were incubated with laboratory test organisms, and they exhibited variable toxicity for different stream sites. In this study we combined bulk- and microscale techniques to...
Metaultramafic schists and dismembered ophiolites of the Ashe Metamorphic Suite of northwestern North Carolina, USA
Loren A. Raymond, Arthur J. Merschat, R. Kelly Vance
2016, International Geology Review (58) 874-912
Metaultramafic rocks (MUR) in the Ashe Metamorphic Suite (AMS) of northwestern North Carolina include quartz ± feldspar-bearing QF-amphibolites and quartz-deficient, locally talc-, chlorite-, and/or Mg-amphibole-bearing TC-amphibolites. Some workers divide TC-amphibolites into Todd and Edmonds types, based on mineral and geochemical differences, and we provisionally add a third type – olivine...
Uncertainty in CO2 storage cost and resource estimates
Steven T. Anderson
2016, Geological Society of America Abstracts with Programs (48)
Carbon capture from stationary sources and geological storage of anthropogenic carbon dioxide (CO2) is an important option to include in strategies for the mitigation of greenhouse gas (GHG) emissions. However, the potential costs of commercial-scale CO2storage are not well constrained, stemming from the inherent uncertainty in current geologic storage resource...
Pre-Mississippian tectonic affinity across the Canada Basin–Arctic margins of Alaska and Canada
David W. Houseknecht, Christopher D. Connors
2016, Geology (44) 507-510
New and reprocessed seismic reflection data on the Alaskan and Canadian Arctic margins of the Canada Basin, together with geologic constraints from exploration wells and outcrops, reveal structural and stratigraphic relationships in pre-Mississippian rocks that constrain models of Canada Basin opening. Lithostratigraphic age and acoustic character indicate that the Devonian...
Animated tectonic reconstruction of the Lower Colorado River region: Implications for Late Miocene to Present deformation
Scott E.K. Bennett, Michael H. Darin, Rebecca J. Dorsey, Lisa A. Skinner, Paul J. Umhoefer, Michael E. Oskin
2016, Conference Paper, Going LOCO Investigations along the Lower Colorado River - 2016 Desert Symposium Field Guide and Proceedings
Although the majority of late Miocene to present Pacific-North America plate boundary strain has been accommodated by faults of the San Andreas and Gulf of California systems, growing evidence of dextral shear east of the San Andreas Fault indicates that a component of plate boundary deformation occurred in the lower...
Early Mesozoic geology in Virginia
Joseph P. Smoot
Christopher M. Bailey, W. Cullen Sherwood, L. Scott Eaton, David S. Powars, editor(s)
2016, Book chapter, The geology of Virginia (Virginia Museum of Natural History Special Publication 18)
No abstract available....
Some contrasting biostratigraphic links between the Baker and Olds Ferry Terranes, eastern Oregon
Merlynd K. Nestell, Charles D. Blome
2016, Micropaleontology (61) 389-417
New stratigraphic and paleontologic data indicate that ophiolitic melange windows in the Olds Ferry terrane of eastern Oregon contain limestone blocks and chert that are somewhat different in age than those present in the adjacent Baker terrane melange. The melange windows in the Olds Ferry terrane occur as inliers in...
Loamy, two-storied soils on the outwash plains of southwestern lower Michigan: Pedoturbation of loess with the underlying sand
Michael D. Luehmann, Brad G. Peter, Christopher B. Connallon, Randall J. Schaetzl, Samuel J. Smidt, Wei Liu, Kevin A. Kincare, Toni A. Walkowiak, Elin Thorlund, Marie S. Holler
2016, Annals of the American Association of Geographers (106) 551-572
Soils on many of the outwash plains in southwestern Michigan have loamy upper profiles, despite being underlain by sand-textured outwash. The origin of this upper, loamy material has long been unknown. The purpose of this study is to analyze the spatio-textural characteristics of these loamy-textured sediments to ascertain their origin(s)....
Geomorphic evolution of the San Luis Basin and Rio Grande in southern Colorado and northern New Mexico
Chester A. Ruleman, Michael Machette, Ren A. Thompson, Dan M Miggins, Brent M Goehring, James B. Paces
2016, GSA Field Guides (44) 291-333
The San Luis Basin encompasses the largest structural and hydrologic basin of the Rio Grande rift. On this field trip, we will examine the timing of transition of the San Luis Basin from hydrologically closed, aggrading subbasins to a continuous fluvial system that eroded the basin, formed the Rio Grande...
Golden-winged Warbler nest-site habitat selection: Chapter 7
Theron M. Terhune II, Kyle R. Aldinger, David A. Buehler, David J. Flaspohler, Jeffrey L. Larkin, John P. Loegering, Katie L. Percy, Amber M. Roth, Curtis G. Smalling, Petra Wood
2016, Book chapter, Golden-winged Warbler ecology, conservation, and habitat management (Studies in Avian Biology, volume 49)
Avian habitat selection occurs at multiple spatial scales to incorporate life history requirements. Breeding habitat of Golden-winged Warblers (Vermivora chrysoptera) is characterized by largely forested landscapes containing natural or anthropogenic disturbance elements that maintain forest patches in early stages of succession. Breeding habitat occurs in a variety of settings, including...
Geologic and geophysical maps and volcanic history of the Kelton Pass SE and Monument Peak SW Quadrangles, Box Elder County, Utah
Tracey J. Felger, David M. Miller, Victoria E. Langenheim, Robert J. Fleck
2016, Miscellaneous Publication 16-1DM
The Kelton Pass SE and Monument Peak SW 7.5' quadrangles are located in Box Elder County, northwestern Utah (figure 1; plate 1). The northern boundary of the map area is 8.5 miles (13.7 km) south of the Utah-Idaho border, and the southern boundary reaches the edge of mud flats at...
Terrestrial cosmogenic surface exposure dating of glacial and associated landforms in the Ruby Mountains-East Humboldt Range of central Nevada and along the northeastern flank of the Sierra Nevada
Steven G. Wesnousky, Richard W. Briggs, Marc W. Caffee, Rick J. Ryerson, Robert C. Finkel, Lewis A. Owen
2016, Geomorphology (268) 72-81
Deposits near Lamoille in the Ruby Mountains-East Humboldt Range of central Nevada and at Woodfords on the eastern edge of the Sierra Nevada each record two distinct glacial advances. We compare independent assessments of terrestrial cosmogenic nuclide (TCN) surface exposure ages for glacial deposits that we have determined to those...
Cascade Mountain Range in Oregon
David R. Sherrod
2016, Book chapter, The Oregon Encyclopedia
The Cascade mountain system extends from northern California to central British Columbia. In Oregon, it comprises the Cascade Range, which is 260 miles long and, at greatest breadth, 90 miles wide (fig. 1). Oregon’s Cascade Range covers roughly 17,000 square miles, or about 17 percent of the state, an...
Analysis and interpretation of stress indicators in deviated wells of the Coso Geothermal Field
Martin Schoenball, Jonathan M. G. Glen, Nicholas C. Davatzes
2016, Conference Paper, Proceedings of the 41st workshop on geothermal reservoir engineering
Characterizing the tectonic stress field is an integral part of the development of hydrothermal systems and especially for enhanced geothermal systems (EGS). With a well characterized stress field the propensity of fault slip on faults with known location and orientation can be identified. Faults that are critically oriented for faulting...
Potentiometric surface and water-level difference maps of selected confined aquifers in Southern Maryland and Maryland’s Eastern Shore, 1975-2015
Stephen E. Curtin, Andrew W. Staley, David C. Andreasen
2016, Report
Key Results This report presents potentiometric-surface maps of the Aquia and Magothy aquifers and the Upper Patapsco, Lower Patapsco, and Patuxent aquifer systems using water levels measured during September 2015. Water-level difference maps are also presented for these aquifers. The water-level differences in the Aquia aquifer are shown using groundwater-level data...
U-Pb, Re-Os, and Ar/Ar geochronology of rare earth element (REE)-rich breccia pipes and associated host rocks from the Mesoproterozoic Pea Ridge Fe-REE-Au deposit, St. Francois Mountains, Missouri
John N. Aleinikoff, David Selby, John F. Slack, Warren C. Day, Renee M. Pillers, Michael A. Cosca, Cheryl Seeger, C. Mark Fanning, Iain Samson
2016, Economic Geology (111) 1883-1914
Rare earth element (REE)-rich breccia pipes (600,000 t @ 12% rare earth oxides) are preserved along the margins of the 136-million metric ton (Mt) Pea Ridge magnetite-apatite deposit, within Mesoproterozoic (~1.47 Ga) volcanic-plutonic rocks of the St. Francois Mountains terrane in southeastern Missouri, United States. The breccia pipes cut the...
Geology and geomorphology of the Carolina Sandhills, Chesterfield County, South Carolina
Christopher S. Swezey, Bradley A. Fitzwater, G. Richard Whittecar
2016, Book
This two-day field trip focuses on the geology and geomorphology of the Carolina Sandhills in Chesterfield County, South Carolina. This area is located in the updip portion of the U.S. Atlantic Coastal Plain province, supports an ecosystem of longleaf pine (Pinus palustris) and wiregrass (Aristida stricta), and contains three major...
Regional and local correlations of feldspar geochemistry of the Peach Spring Tuff, Alvord Mountain, California
David C. Buesch
2016, Conference Paper, Mojave Miocene: Desert Symposium 2015
The chemical composition of feldspar grains in an ignimbrite from the Spanish Canyon Formation in the Alvord Mountain area, California, have been used to confirm similarities in three measured sections locally, and they are similar to exposures of the Peach Spring Tuff (PST) regionally. Feldspar grains were identified on the...
Upper Maastrichtian ammonite biostratigraphy of the Gulf Coastal Plain (Mississippi Embayment, southern USA)
Ekaterina Larina, Matthew P. Garb, Neil H. Landman, Natalie Dastas, Nicolas Thibault, Lucy E. Edwards, George Phillips, Remy Rovelli, Corinne Myers, Jone Naujokaityte
2016, Cretaceous Research (60) 128-151
The Cretaceous outcrop belt of the Mississippi Embayment in the Gulf Coastal Plain (GCP) spans the Cretaceous/Paleogene (K/Pg) boundary. A detailed reconstruction of this time interval is critical for understanding the nature of biotic and environmental changes preceding the end-Cretaceous Mass Extinction event and for deciphering the likely extinction mechanism...
Radiometric dating of marine-influenced coal using Re–Os geochronology
Gyana Ranjan Tripathy, Judith L. Hannah, Holly J. Stein, Nicholas J. Geboy, Leslie F. Ruppert
2016, Earth and Planetary Science Letters (432) 13-23
Coal deposits are integral to understanding the structural evolution and thermal history of sedimentary basins and correlating contemporeous estuarine and fluvial delatic strata with marine sections. While marine shales may readily lend themselves to Re–Os dating due to the dominance of hydrogenous Re and Os,...
Changes in seasonal climate outpace compensatory density-dependence in eastern brook trout
Ronald D. Bassar, Benjamin H. Letcher, Keith H. Nislow, Andrew R. Whiteley
2016, Global Change Biology (22) 577-593
Understanding how multiple extrinsic (density-independent) factors and intrinsic (density-dependent) mechanisms influence population dynamics has become increasingly urgent in the face of rapidly changing climates. It is particularly unclear how multiple extrinsic factors with contrasting effects among seasons are related to declines in population numbers and changes in mean body size...
Conservation genomics reveals multiple evolutionary units within Bell’s Vireo (Vireo bellii).
Luke B. Klicka, Barbara E. Kus, Pascal O. Title, Kevin J. Burns
2016, Conservation Genetics (17) 455-471
The Bell’s Vireo (Vireo bellii) is a widespread North American species of bird that has declined since the mid-1960s primarily due to habitat modification. Throughout its range, Bell’s Vireo populations are regulated under varying degrees of protection; however, the species has never been characterized genetically. Therefore, the current...
Profiles of reservoir properties of oil-bearing plays for selected petroleum provinces in the United States
Philip A. Freeman, Emil D. Attanasi
2016, Open-File Report 2015-1195
Profiles of reservoir properties of oil-bearing plays for selected petroleum provinces in the United States were developed to characterize the database to be used for a potential assessment by the U.S. Geological Survey (USGS) of oil that would be technically recoverable by the application of enhanced oil recovery methods using...
Effects of harvesting forest biomass on water and climate regulation services: A synthesis of long-term ecosystem experiments in eastern North America
Jesse Caputo, Colin D Beier, Peter M Groffman, Douglas A. Burns, Frederick D Beall, Paul W. Hazlett, Thad E Yorks
2016, Ecosystems (19) 271-283
Demand for woody biomass fuels is increasing amidst concerns about global energy security and climate change, but there may be negative implications of increased harvesting for forest ecosystem functions and their benefits to society (ecosystem services). Using new methods for assessing ecosystem services based on long-term experimental research,...
A dynamic population model to investigate effects of climate and climate-independent factors on the lifecycle of the tick Amblyomma americanum (Acari: Ixodidae)
Antoinette Ludwig, Howard S. Ginsberg, Graham J. Hickling, Nicholas H. Ogden
2016, Journal of Medical Entomology (53) 99-115
The lone star tick, Amblyomma americanum, is a disease vector of significance for human and animal health throughout much of the eastern United States. To model the potential effects of climate change on this tick, a better understanding is needed of the relative roles of temperature-dependent and temperature-independent (day-length-dependent behavioral...
